package longcaisuyun.longcai.com.utils;

import android.util.Log;

/**
 * Created by Administrator on 2016/6/13.
 * 经纬度计算距离
 */
public class JuLiJiSuan {
    private static final double EARTH_RADIUS = 6378137.0;
    // 返回单位是千米
    public static Double getDistance(double longitude1, double latitude1,
                                     double longitude2, double latitude2) {
        double Lat1 = rad(latitude1);
        double Lat2 = rad(latitude2);
        double a = Lat1 - Lat2;
        double b = rad(longitude1) - rad(longitude2);
        double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2)
                + Math.cos(Lat1) * Math.cos(Lat2)
                * Math.pow(Math.sin(b / 2), 2)));
        s = s * EARTH_RADIUS;
        s = Math.round(s * 10000) / 10000000;
        Log.e("距离有多远",s+"");
//        DecimalFormat fnum  =   new  DecimalFormat("##0.00");
//        String   dd=fnum.format(s);
        return s;
    }
    private static double rad(double d) {
        return d * Math.PI / 180.0;
    }
}
